The arrested is Shilpi Begum, 25, hailed from Master Para village in Aditmari upazila of Lalmonirhat district.
Rangpur Kotwali Police Station officer-in-charge Mahfuzur Rahman said acting on a tip-off, a team of police conducted a raid in the area and arrested the woman along with the drugs.
Meanwhile, police recovered 243 bottles of Phensedyl from her rented house in the area.
A case was filed with the police station against her under Narcotics Control Act and legal steps would be taken in this regard, the OC added.